Roller Chain Sprocket; 3/4" Bore; 40 Chain; 16 Teeth; 1 Row of Teeth; Hardened Teeth; 2.814" Outside Diameter; 2-9/16" Pitch Diameter; B-Hub One Side; Finished Bore Mount; No Bushing; 1/2" Chain Pitch; ANSI Roller Chain; Keyway; Steel Material